Gas-engine



(No Model.) 7 3 SheetsSh,eet 1.

J. LIZOTTE.

GAS ENGINE.

Patented Mar. 15, 1898,

3 ShtsSheet 2. J. LIZOTTE GAS ENGINE (No Model.)

Patent ed Mar. 15,1898.

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- 3 Sheefis-Sheet 3.'

Patented Mar. 15', 1898.

J. LI ZOTTE. GAS ENGINE.

III

(No Model.)

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. lllll JOSEPH LIZOTTE, OF QUINCY, MASSACHUSETTS, ASSIGNOR OF ONE-I-IALF' TO MELLEN N. BRAY, OF BOSTON, MASSACHUSETTS.

GAS-ENGINE.

SPECIFICATION forming part of Letters Patent No. 600,675, dated March 15, 1898. Application filed June 28, 1897- Serial No. 642,569. (No model.)

To all whom, it may concern.-

Be it known that I, JOSEPH LIZOTTE, of Quincy, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Gas-Engines, of which the following, taken in connection with the accompanying drawings, is aspecification.

My invention relates to gas-engines, and to that particular class of such engines which have two vertical single-acting cylinders; and it consists in certain novel features of construction, arrangement, and combination of parts, which will be readily understood by reference to the description of the accompanying drawings and to the claims hereto appended and in which myinvention is clearly pointed out.

Figure 1 of the drawings is a front elevation of an engine embodying my invention with a portion of one valve-chamber shown in section. Fig. 2 is a vertical section on line w 00 on Fig. 1 and showing the right-hand cylinder in elevation. Fig. 3 is a sectional elevation looking toward the left of Fig. 1, the cutting plane being on line y ,1 on Fig. 1. Fig. 4 is a plan of one cylinder-head with the outer cover removed. Fig. 5 is a sectional plan of said head and the valve-chambers, the cutting plane being on line z z on Fig. 3. Fig. 6 is an elevation of the crank-shaft, cranks, and levers for operating the circuitclosers and theeXhaust-valves. Fig. 7 is a horizontal section on line 0 v on Fig. 6. Fig. 8 is a central verticalsection of the upper portion of the circuit-closing and spark-producing device, and Figs. 9 and 10 are respectively an elevation and a sectional elevation of the oscillating portion of the circuit-closing and spark-producing device.

In the drawings, Ais the bed of the engine upon which are erected the columns B 13, upon the upper ends of which is supported the table or plate 0, to which are bolted the lower open ends of the vertical cylinders D and D, said table 0 having openings through it in axial line with said cylinders, with diameters slightly larger than the bores of said cylinders, as clearly shown in Fig. 3.

D and D are castings forming the cylinder-heads and each having formed therein the exhaust-chamber C6, the explosion-chamber b, and a water-chamber c, the latter being closed by the cover (1 and communicating through the holes 6 with the water-chamber f, surrounding the upper portion of the cylinder D or D.

E is the crank-shaft, mounted in suitable bearings A, A A and A formed integral with the bed A, said shaft E having formed therein two cranks E and E arranged with their crank-pins on opposite sides of the axis of said shaft, as shown in Fig. 1.

F and F are connecting-rods connecting the cranks E and E respectively, to the pistons G and G, as shown.

The shaftE has mounted on one end thereof the fly-wheel H and at or near the opposite end the eccentric I for operating the plunger of the pump J to force water through the pipes g, g, and g to the water-chambers c and thence through the holes e to the chambers f,

surrounding the cylinders.

The gas is admitted through the pipe h to the interior of the plug-cock K, and air is admitted thereto through the pipe h, the pro-- portions of air and gas being regulatedby turning said plug by the hand-lever K in a well-known manner. L and L are pipes leading from said plug-cock to the explosionchambers 12, the openings to said explosionchambers being normally closed by the inletvalves i, held to their seats by springs.

M is the exhaust-pipe, communicating with the interior of the exhaust-chamber a, which lower wall of said exhaust-chamber and is surrounded by the spiral spring a the tension of which tends to hold said valve upon its seat until force is applied to said stem to raise it.

The upper wall of the explosion-chamber b has a threaded opening therein, in which is screwed the tubular and internally-threaded hub N, in which is adjustably screwed the sleeve j, provided with the check-nutj, and having fitted thereto, but insulated therefrom by the insulating-bushing 7t and flanges 76, the stem Z, provided at its lower end with the head Z and at its upper'end with the bindin g-nut Z by which it is firmly secured in said sleeve 3'. (See Fig. 8.) A wire 2 is firmly clamped in contact with said stem Z by the thumb-screw Z and the opposite end thereof is connected to one pole of a suitable battery or other source of electric energy, the opposite pole of which is connected to any fixed metallic portion of the machine.

The head Z of the stem Zhas firmly secured in a socket therein the closely-wound spiral spring m, which depends from said head and has form ed at its lower end the loop m, which serves as one of the electrodes or contactpoints of the circuit-closing devices, the other contact-point being the electrode 0, set in a diametrical socket in the oscillating shaft 0, mounted in the side wall of the explosionchamber 1), as shown in Fig. 1.

The contact end of the electrode Ois made up of the metal portion '21,, formed integral with the shank O, the separate metal piece at, the insulating material 11 inserted between the metal portions '11 and n and extending between the lower end of the piece it and the shank of the electrode 0 and upward outside of said metal piece 72, the parts being secured together by the washer n and screw 71 as shown in Figs. 9 and 10.

WVhen the upper end of the electrode 0 is oscillated toward the front of the explosionchamber, the portion 01 comes in contact with the loop m of the spring m to close the cir cuit, and when said contact is broken a spark is produced in a well-known manner. When the motion of said electrode 0 is reversed and its upper end is moved toward the rear, the metal piece it comes-in contact with the loop on, but no circuit is closed, for the reason that the piece at is completely insulated and as a consequence no spark is produced. The hole through the metal piece 12 for the passage of the screw n is made considerably larger than the shank of said screw, so as to insulate it therefrom, as shown in Fig. 10.

The shaft 0 has firmly secured upon its outer end the radius-arm P, to the movable end of which is pivoted one end of the connecting-rod P, the opposite end of which is pivoted to the front end of the lever Pflwhich is fulcrumed upon a stud 19, set in the side of the segmental casing Q, which is supported upon the upper ends of the central pair of columns 13 B, between the two cylinders D and D.

The casing Q incloses the sprocket-wheel Q, mounted upon the shaft q, fitted to bearin gs carried by the lower ends of the two arms of the forked yoke R and projecting through slots in the sides of said casing and having secured upon each end thereof outside of said casing a crank-disk q, in which is set a crankpin g upon which is loosely fitted a block g which in turn is fitted to and movable endwise in a longitudinal slot (1 cut through the rear arm of the lever P as shown in Fi s. 6

and 7.

The connecting-rods P have secured thereon the tappets p p, which, when said rods are approaching the ends of their downward movements, come in contact with trucks 4", mounted in studs set in theinner ends of the lovers S S, fulcrumed at r and having studs r set in their outer ends in positions to engage the lower ends of the stems of the exhaust-valves a to lift said valves against the tension of the springs a when the tappet-s 19 come in contact with the trucks 7, as above described.

The crank-shaft E has mounted thereon between the bearin gs A and A a sprocket-wheel 8, having a diameter equal to one-half the diameter of the sprocket-wheel Q and is connected therewith by the chain T, which transmits the rotary motion of said crank-shaft to the sprocket-wheel Q and to the shaft q in such a manner that the shaft q makes one revolution to two revolutions of the crankshaft. The shaft q may be adjusted vertically by the set-screw t, threaded in the upper end of the yoke R and bearing upon the top of the casing Q for the purpose of adjusting said wheels to the length of the chain, as shown in Fig. 2. Each cylinder is supplied through a pipe u with oil from an oil-cup U, only one of which is shown.

The water admitted to the chambers surrounding the cylinders is discharged therefrom through the pipes to and M The operation of my invention is as follows: The several parts of the engine being in the positions shown in the drawings, if a mixture of gas and air or other explosive material is admitted to the explosion-chambers b of the cylinder D and at the same time the fly-wheel be moved about its axis in the direction indicated by the arrow on Fig. 2 the piston in said cylinder descends, tending to create a vacuum above said piston, thereby causing the gas to fill said cylinder above said piston. WVhen the piston G has reached its lowermost position, the piston G will be in its highest position, and as the fiy-wheeland the crank-shaft continue to be moved in the same direction the piston G is moved upward, compressing the explosive contained in its cylinder, and at the same time the piston G descends to its lowest position, thereby causing said cylinder to be filled with the explosive, and while the crank E is passing its upper dead-center the portion 42 of the circuit closing arm 0 in the explosive-chamber of cylinder D comes in contact with the loop m of the spring m, thereby closing an electric circuit, and as the said crank has slightly passed said dead-center the contact-point n and the loop m are separated, thereby breaking the circuit and producing an electric spark which ignites the compressed gas and causes an explosion and consequent expansion of said gas,which forces the piston G to its lowest position, and through the rotation of the shaft E the piston Gis moved to its highest position, thereby compressing the charge of explosive contained in the cylinder D, and during the passage of the crank E past its upper deadcenter an electric circuit is closed and broken,

a spark is produced, the charge of compressed gas is ignited, an explosion occurs which forces the piston Gr to its lowest position, and the piston G is moved to its highest position, and the products of the explosion are exhausted through the port a, the valve a having been raised by the action of the tappet 19 upon the lever S, as described. During the next half-revolution of the crank-shaft the piston G is descending and afresh charge of explosive is being drawn into the cylinderD, while the piston G is moved upward and the products of theexplosion are being exhausted from the cylinder D, and during the succeeding half-revolution the piston G is moved upward, compressing the charge of explosive in the cylinder D, and the piston G is descending, and a fresh charge of explosive enters the cylinder D, the compressed explosive in cylinder D is ignited and expanded to move said piston G to its lowest position and the piston G to its highest position, compressing the explosive in the cylinder D, and then said compressed explosive in the cylinder D is ignited just a half-revolution after the explosion has occurred in the cylinder D.

It will be seen from the foregoing that, owing to the fact that the main crank-shaft makes two revolutions to one of the shaft (1 and to the arrangement of the connecting mechanism between said shaft q and the exhaust-valves and the circuit-closing devices, an explosion takes place in both cylinders in a single revolution and only a half-revolution apart, while in the next revolution no explosion occurs in either cylinder.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a gas-engine, the combination of two single-acting cylinders arranged parallel to each other; a crank-shaft to be operated thereby and provided with two cranks arranged opposite to each other; pistons in said cylinders connected one to each of said cranks;

explosion-chambers communicating one with each of said cylinders; a normally stationary but yielding electrode projecting into each of said explosion-chambers; an oscillating electrode located within said chamber in position to contact with said yielding electrodewhen oscillated; the shaft q; the sprocket-wheel Q and the crank-disks q mounted on said shaft q; the crank-pins g set in said crank-disks; the levers P P the connecting-rods P P; the radius-arms P P; the shafts O carrying, at their inner ends, the electrodes 0; the sprocket-wheel s mounted upon said main crank-shaft and having a diameter equal to one-half the diameter of the sprocket-wheel Q and the chain T connecting said two sprocket-wheels all constructed and arranged to operate substantially as described.

2. The combination of the two cylinders D and D each provided with an explosion-chamber b, communicating therewith; the shaft E having two cranks arranged opposite to each other; the shaft q arranged parallel to the shaftE; the sprocket-wheels sand Q mounted respectively on said shafts E' and q, and having diameters two to one; the chain T connecting said wheels; the crank-pins (1 carried by the shaft q; the slotted levers P engaged by said crank-pins; the connecting-rods P; the radius-arms P; the shaft 0; the electrode O mounted in said shaft 0; the normally stationary but yielding electrode m m; the tappets p p carried by the rods P; the levers S, S, the exhaust-valves a and the springs a In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 23d day of June, A. D. 1897.

JOSEPH LIZOTTE.

Witnesses:

N. G. LOMBARD, ROBT. L. GILMAN. 

